Coffee-mill.



Nm 0. 9 l QW 2 TM C 0 D E ml. N E T A, P

L J l ,L N L I m M N O E RE n.. L C AA 5. 0 ,1. 4 3. 8 m N APPLICATION FILED JULY 1l 1901.

3 SHEETS-SHEET l,

klllxxll'llf Z/ezzaLL mf; @my @y 73g @am l ful onlus rxrnu ca.. wAnmNoraN. D. c.

PATHNTED 001251906.

A. E. BRONSON, Jn.

COFFEE MILL. APPLICATION FILED JULY 1. 1901.

3 SHEETS-SHEET 2.

No. 834,105. 2 PATENTED 00123, 1906.

A; E. BRoNsoN, JB.

COFFEE MILL.

APPLICATION I'ILED JULY 1, 1901.v

v3 l l a sHzBTs--SHBET a.

. UNITED .STATES PATENT OFFICE.

ADELBERTVE.l BRONSON,=JR., OF CLEVELAND, OHIO, ASSIGNOR TO THE BnoNsoN-WALTON oF omo.vl

Noyssd.

Specification of Letters Patent.-

pplioatiou iiled July l, 1901. Serial No. 66,693.

COFFEE-MlLL.

Patented O ct. 23, 1906.

of which the following A'is a full, clear, and

exact descriptionyreference beingV had to the accompanying drawings,y

The object of this inventlon istoprovide a i coffee-mill 'which shall be efficient and durable in service "and at the same time very cheap to construct. `*"Thegmill includes a shell formed with a stationary bur and av coperatingrunning burfafcanisterfor feeding them, and a cup forreceivi-n'g'the ground' product.

- The present invention is fconceined with by it at once presents a grinding-surface and a back for the machine, with the adjustment -of the runningbur, and with-'the arrangements for supporting the supply-canister and the receiving-can. 4It may-be conveniently summarized as consisting in the combinations of elements to the aboveends, or some of them, as hereinafter explained' and enumerated-in the claims.

The drawings clearly show the invention.

vFigure 1 isa side velevation of the mill complete; Fig. 2,- a front elevation of the'shell;

ig. 3, a-rear elevation of the' shell; Fig. 4, a

vertical lcentralsection through the shaft of the runnin bur; Fig. 5, a'horizontaly section thro'ug such shaft 5' Fig. 6, a face eleva-` `tion`of the bur; Fig. 7, y'a plan of the shell;

Fig. 8, a plan looking-into the canister; Fig. 9, a vertical section throughfthe upper por- Fig. 10, a planfof the receiving-cup in place, being sectioned through the legs of the shell as on the linelO 10 ofFig. l.y Figs. 11 and 12 are views of the cooperating faces of thel base a, in which there isa "holebounded by a by turning downthe metal of the. base. iiange a is thus of a U shape and engages and straight line at the back and curved around the front, as shown in Fig. 8. At the edge of this hole are'depending flanges c 0,2,y formed The vbackboard or other support. L may, if desired, be fastened, in addition, near y makes a close connection with the inner side' of the shell B, the upper end of which has the f U-shaped wall b, as` clearly appears from Fig.

COMPANY, OF-CLEVELAND, OHIO. A CORPORATION. y

- 7. The iiange'a2 extends across between the ltwo sides of this wall, preventing escape of unground material at the back.

The shell B is supported from a backboard or other suitable vertical support by the two kupper-legs bf and the two ,lower legs b2. :These upper legs are recessed ,at their extreme upper edges, as shown at b3, Aand in 1 this recess takes the depending edge a3 vof the canister, which is thus clamped against the l The canister its upper end by a nailor' screw to the backboard.., thearrangementof the running bur, wherei The shell B` is preferably one integral cast-l ing. It has a dome-like body b4, on' the inner face of which are grinding-ribs b5, constitutf ling the stationary bur. Centrally of the body, on, the .outer side, is ,a bossu be, which is ling-ribs b5 is the'annular flat space 57, and around the edge of this` isthe partially-cylindrical wall bs. This wall 68 merges at its up- Vper end into theU-shaped wall b and the supporting-legs b and at its lower end into thelegs b2. The wall isv thus discontinued betweenithe legsl both above and below to allow free entrance and exit openings. The legs b above preferably continue separated, while those below are joined by an integral cross-bar b". Beneath the forward, portion of the U-shaped wall b the d ome b4 becomes `hopper-like, as at b and merges with the I tion of the shell and thebase of the canister; v

The running bur is designated C. 'It has a dome-like body c, roughened or ribbed on its a short cylindrical wall c, at the redge of `which is an annular iiange c2.' The external diameter. of this flange is j ust slightly less than the internal diameter of the wall bs of the shell. l occupy the relative position shown in Figs. 1 and 5, and thusthe wall bs forms a guide for` centering the running bur.

Extending from the center of the buris the shank, which is madeV in special formnamely, there is iirst.y a cylindrical ortion c4, then a cylindrical portion of smal er diameter c5, beyond this a squared portion c, and

beyond this a threaded portion c7. The

hollow. Beyond the outer edge of the grindl convex side, while at the edge of theseribs isV The running bur and shell in use IOO shank of the bur is long enough to extend through the boss be and somewhat beyond. Surrounding the portion c6 of the runningbur shank is a coiled spring D, which in operation is compressed between the shoulder formed by the enlarged portion of the shank and an inwardly-projecting annular ange Z112, formed around the bore of the boss be. This spring thus when compressed tends to separate the two grinding -surfaces The portion c4 of the shank not only forms a bearing-surface for the rotation of the running bur, but keeps the spring out of the way of the coffee being ground. By making the shell-and bur in the dome-like form shown a much-Inoreeflicient result is obtained than if they were either conical or flat, for by my construction the grinding area near the shank is relatively increased, whereby an increased leverage is obtained for grinding-that is, a greater proportion of the grinding is done near thel center, and hence more efiiciently.

' The running bur is rotated by the crank E, which yhas the usual handle e at its outer end and at its inner end has la head e with a squared hole ysurrounding the portion cG of the running-bur shank. A nut F screws 'onto the threaded end c7 of the shank and by being turned'to variouspositions adjusts the distance between the two grinding bur-surfaces, the nut drawing the surfaces together and the spring lDtending to force them apart. In orderA to prevent the nut working loose and to obviate thenecessity of an additional jamnut, I provide one or more locking projections f on the inner face of the nut, which are adapted to rregister with Avarious recesses e2 onthe outer face of the crank. The force of the'lspring-keeps the-projection and groove in engagement wherever they may be left, so thatfthe nut willnot-workloose- The yielding force ofthe spring, however, allows the nut to ybe-turned `in eitherdirection, as desired,'to adjust the mill.

"The-coffee orother coarse material to be ground passes from the supply-canister A through 'the Aentrance-passage provided by the walls l) and b. into the space between the grinding-surfaces b5 and c and is ground as it passes downward and outward'between them, the ground coffeepassing into the annular conduit provided by the surfaces t7 bs c c2, Fig. 5, and discharging betweenthe legs b2 b2. In order to prevent it being carried around after being ground, I make-theribbed surface b5 of the -shell in such 'form that at one sideof the entrance-opening it is too close to the running bur to let the ground material pass back into the entrance-opening, while on the'other side it-is far enough away from it'to admit=theunground material. Thus in a right-hand mill when therunning bur is in place'the'grinding-surface of the stationary bur at the left-hand side of the entrance-passage t, Fig. 7,1is very Anearly -in contact with the running bur, while at the right-hand side 515 it is a considerable distance from it, and the mill being turned in a right-hand direction to grind the coffee the latter will necessarily pass into the large opening, but when ground cannot pass back into the entrance-opening, but drops into the annular space at the outer edge, a pair of lugs b1 projecting rearward at either side of the entranceopening to the shell, preventing unground vmaterial passing into this annular space.

The wall bs is deep enough so that the flange c2 of the running bur is within it in all portions of adjustment, the bur thus constituting the back of the mill.

The can G which receives the coffee is very simply supported by the shell as follows: In the rear side of the can, near the top, is made an opening g beneath the wire thereof, and this opening hooks over anintegral lug b1, projecting upward fromthe cross-bar b" between the lower legsiof the shell, while this can is held in position by the projecting lugs b 617, standing on each side of the lug b1 and having faces inclining thereto, so that these lugs may conveniently engage the cylindrical surface of the can. To make the can hang true, I bend back a little the upper edge and its wire just above the opening g, as indicated at g', Fig. 10. j also to slightly bend forward the can just below the opening g, as shown at g2, Fig. 4.

Having described my invention, I claiml. A coffee-mill composed of `a vertical shell and a running bur mounted `thereon and supported thereby, said vertical shell having upon one face a stationary bur adapted to coperate with the running bur,'a short cylindrical portion extending from the periphery ofthe ruiming bur havingan annular flange extending radially therefrom, a flange on each side of the shell embracing the rear portion of running bur in such manner as to approach the annular iiangereferred to and form side channels for guiding the ground material downward to adischarge-opening.

2. A coffee-mill comprising'a vertical stationary shell having a stationary bur formed on'its inner face, a running bur mounted on and supported `by said stationary shell and adaptedto coper ate with tne stationary bur formed thereon, flanges extending from the peripheries of the running bur and stationary shell at an angle to each other andapproaching each other closely in such manner asto form'guiding side'channels for leadingithe ground material to a discharge-opening, the upper portion of the stationary shell being swelled so as toform a feed-chute, and lshort walls at each side of the chute extending rearwardly toward and approaching closely to the said flange on the runningbur, thereby closingthe upperends of the said side channels so as to prevententrance thereto of unground material 1 from: the chute.

It is of advantage 9 IOO ' an upwardly-extending swelled wall with a smooth vertical mouth., a running bur having a radially-extending annular fiange projecting from its base, said flange forming together with said swelled wall the entrancepassage to the grinding-burs, a canister above said shell having in its base an opening, flanges depending vertically from the edge of said opening, the forward flange fitting they mouth of the swelled wall and the rear flange extending from side to side of the passageway in front of the annular flange of the running bur, and supporting means on the rear of said vertical shell adapted to form in connection with said front wall a support for the canister whereby'the sarne may be readily removed and attached.

4. In a coffee-mill, a stationary shell having a stationary bur thereon, a rotary bur mounted on the stationary shell and having a radial extension, an open-topped swelled feed-chute on the upper part of the stationary shell having its wall vertical about the edge. a canister above the shell having an opening Vin its bottom, vertical flanges depending about said opening, the forward fiange fitted to the vertical wall of the feedchute, the rear flange depending in front of the radial extension on the running bur, a rearward projection of the shell having a vertically-walled ledge, and a vertically-deending fiange on the canister fitted to said edge, whereby the canister may be removed and appliedA to the shell without adjustment. of the various parts.

5. In a coffee-mill, a vertical shell adapted to be secured to a support and having an upwardly-extending wall forming an entrancepassage to the grinding-burs, legs projecting from the rear of said wall, shoulders on said legs, a canister above said shell havin@i an` opening in its base, flanges depending from the edge of the opening, the forward flange engaging the upwardly-extending wall, the rear flange extending across the feed-passage from side to side, the rear edge of the canister being constructed to engage the shoulders on said legs, whereby the canister may be firmly held in place between the upwardly-extending wall of the shell and the support on which the mill may be mounted.

6. In a coffee-mill, a vertical shell having rearwardly-extending legs, the eXtreme ends of said legs being recessed at their upper edges, combined with a canister above said shell, having an opening in its base communica-ting therewith, and a downwardly-extending flange adapted to project int-o and occupy the recess provided in said legs, substantially as described.

7. In a coffee-mill, a shell having a delivery-orifice for 4the ground material and an upwardly extending projection below the delivery-orifice and lateral lugs extending horizontally on each side of said vertical projection, a receiving vessel having an opening adapted to hook over the vertical projection and a bead or flange on each side of said opening adapted to rest on `the lateral projecting lugs. .In testimony whereof I hereunto afliX my signature in the presen ce of two witnesses.

ADELBERT E. BRONSON, Jn.

Witnesses l ALBERT I-I. BATES, H. WISE. 

